Don't have much time, but how about transferring any sum of money from one end of the world to the other in seconds (ok, Bitcoin not the best example of this at the moment, but has been, and will be again). Do that via 'conventional' money (already sitting in the bank to allow for a fair starting point) and you'd most likely have to go into the bank (as most online services seem to struggle with authorising international transactions), prove who you are, fill in paper work, pay a fee, wait for the bank to 'approve' the use of your own money, then transfer it, and as far as I'm aware, wait 72 hours for it to arrive. How is that efficient in this modern age?
When I log on to my personal internet banking (HSBC) I can move money to any bank account in the world and it hit their account within minutes.... I can transfer up to £50,000. I just need the recipients IBAN number in addition to their usual account number and sort code.
I get small payments from Amazon KDP (kindle direct publishing) and they are even paying me something like $1 with an IBAN transfer.
Also, HSBC will guarantee that the exchange rate at the point of transfer at my end is the exchange rate they will get at their end.... whereas with Bitcoin if the verification is delayed, the seller or buyer could be left feeling out of pocket due to fluctuations.
The cost of transferring up to £50k in a matter of minutes, with an exchange rate guarantee = £4 if to another bank (any bank), £0 if it is to another HSBC account (anywhere in the world).
I make that a 0.008% fee on a transfer of £50,000....
This is why I'm saying that I don't think this problem actually exists, either the 'speed' thing or the 'low cost' thing.... perhaps this was valid in 2011, or even 2013, but I don't think in 2018 there is any problem here to try and solve. And that may be why Bitcoin is now started to position itself as a 'store of wealth' instead of a currency for transactions.
If anybody here lives overseas and has an HSBC account I'd be happy to transfer them £1 so we can put this to the test.
There's also other ways of transferring fiat of course, such as paypal. Even if I had to credit my paypal account with my debit card and then transfer to another paypal account... I'm pretty sure I could get this done within 15 minutes, 30 minutes?.